package gateway.config;

import lombok.AllArgsConstructor;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.List;

@Component
@AllArgsConstructor
public class SwaggerResourceProviderConfig implements SwaggerResourcesProvider {

    /**
     * Swagger2默认的url后缀
     */
    public static final String SWAGGER2URL = "/v2/api-docs";
    /**
     * 网关路由
     */
    private final RouteLocator routeLocator;
    private final GatewayProperties gatewayProperties;

    @Override
    public List<SwaggerResource> get() {
        List<SwaggerResource> resourceList = new ArrayList<>();
        List<String> routes = new ArrayList<>();
        //获取网关中配置的route
        routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
        gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId()))
                .forEach(routeDefinition -> routeDefinition.getPredicates().stream()
                        .filter(predicateDefinition -> "Path".equalsIgnoreCase(predicateDefinition.getName()))
                        .forEach(predicateDefinition -> resourceList.add(
                                swaggerResource(
                                        routeDefinition.getId(),
                                        predicateDefinition
                                                .getArgs()
                                                .get(NameUtils.GENERATED_NAME_PREFIX + "0")
                                                .replace("/**", SWAGGER2URL)
//这里拼接时需要注意
//网关配置account映射到account-service，要么将网关的配置修改成account-service映射成account-service
//要么就在这个拼接处解决
                                )
                        )));
        return resourceList;
    }

    private SwaggerResource swaggerResource(String name, String location) {
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("2.0");
        return swaggerResource;
    }
}
